Grinding attachment



' H. G. KENNEDY.

GRINDING ATTACHMENT. APPLICATION FILEVD SEPT. 18. 1919.

1,428,289, I PatentedSept. 5,1922.

2 SHEETS-SHEET Horace G.Kenned 3mm Wang:

y UNITED, srA Tes To all iohom z'zf mdy concern Patented Sept. 5, 1922.

HORACE G. KENNEDY,'0F DENVER, ooLonAno, Ass'IeNoR 0 F ONE-HALF ToJonitAQ I-IINGLEY,.OF Dmwmeommm.

' GRINDING ATTACHMENT.

Application filed September 18, 1919. Serial-No 324,437.

Be it known that I, HORACE G. KENNEDY, a, citizen of the United States, residing'at Denver, inthe county of Denver and State of Colorado, have invented certain. new and useful Improvements in Grinding Attachments and I do hereby declare the follow.- ing to be a full, clear, and exact description of the invention, such as will enable others skilled intheart'to which it appertains to,

make and use the same."

v This invention relates to grinders and while particularly adapted to internal grinders and especially to internal grinder attachments to a machine having a spindle and having work withia relatively longitudinal movementto said spindle and; especially to an internal grinder attachment for. a lathe, is notlimited theretov j i An object of this invention is to provide a grinder for auto cylinders and the like that may be quickly and readily adjusted to suit'the varying diameters ofthe cylinders being ground that may be rotated on a spindle of alathe or similar machine. a

A further object ofvthis invention is the provision of a compact, simple, and inex: pensive eccentrically variable grinder at tachment fora lathe'and. the like. A further object of this invention is to provide an internal grinder which may be attached to the spindle of a lathe or similar machine in which a cylinder isv held concentric with the spindle and in which it might, in cases, be desired to provide sucha grinder in a compact form so that the same can be easily transported and can be inserted into relatively small cylinders and one that can be readily and quickly adjusted while thespindle is rotated. I With'the above and otherobjects in view,

the invention consists in the novel features of construction, the combination and arrangement of parts hereinafter more fully set forth, pointed out in the claims and shown in the accompanying drawings, inwhich J Figure-1 1s a central sectlonalelevatlonlof v a my grinder, showing a spindle to. which it is attached broken away a'ndalso a cylinder be: ing ground;.partlybrokenaway, v a

Figure 2 is a transverse section taken'aon the line 2-2 of Figure 1, T Q H.

- Figure 3 is a side-1' elevation,v showing 1 a cylinderwin sectiontakenat a spindle 1.

the position shown in Figure 1.' l y pro irimately Figure 4 is a transversesection on the line p 44 in Figure 3, looking in the directionof the v arrows and the grinder being omitted, 1 H F 1g.; 5 1s a' transverse section takenat 5+5 of v Fig. 3,- looking in the i direetionjof I the aII'OW, l Figure 6v is andetailed sectional view-taken on theline66of Figure 1-, and Figure 7isan. elevationof a detail of the counter shaft and mount thereforg 1'.

. Incarrying out my invention, the sam comprises a spindle 1, said spindle being most generally a spindleof alathe, although it might; be of jamillingmachin'e-or other shop machine, such as is commonly found in shops, or a special machine spindle A. r nut 52 is providedwith threads co-mating with the threadsof spindle andpsaidmut is also extended to form an extension of spindle 1 and flanged as at 2. Threaded upon said extension isa member 3 which is flanged 1" at 3?,and'vhetweenuthe flanges 2 andB are;

ball bearingsl and-,4. Themembe'r 3 serves 'to form an inner mount for the ball bear.-

ings and-the-flanges hold the ball 'bea'rings in fixed relation. The pulleys Band 49 constitute I a :unitary structure; freely rotating on the ball bearings at a higher speed-than the The member 3 extended intoan 3 in a'direction'lateral'to itsaxis and-on thisarrn lspivoted at 13 a leverpl2.f Straddling :the

lever 12 are the pulleys 5 an d 10' mounted upon a counter shaft ll, said counter. shaft being suitably arranged. within. a bearing at thelower end of theTlever 12. These pulleys Stand 10 are bothaffixed to shaft-11' so'that tatesh, I 5

A- belt passes from'pulley Pto 10 so that when one is rotated, the other likewise ro- W when the pulley'ri isrotated by main drive rotatingpulley. 4 pulley 10 is] rotated,

which in-turn will rotate 5V... Thebelt passes from pulleyj5 -to pulley 5 so "thatwhen.

pulley 5 is rotated, the pulley 5'is also Totated and likes rotates a spindle 6. Mounted upon theouter end of spindle 6 is a grinder 6 A spring 14' is attached to the arm 3?- and also to lever-12 forthe purpose-of keep-f ing taut the-belts between saidpulleysn 103 he;,-spindle 6 is arranged withina suit-*-"- able housing 25, said housing being pivotally connected with the member 8 by means of the arms 24' which are pivotally connected as at 16 to one side of the member 3. The concentric relation between the spindle 6 and the spindle 1 is maintained by means pivot 16', pivot lfibeing eccentric relative to spindle 1. The wedges 18 are connected by means of" a rod. 19, one end of which is screw-threaded and passes through the bearings' 3 and through the correspondingly threaded bore of. a ratchet 20. The connecting rod 19 bein giixed from angular movement relative to its axis and ratchet 20' be ing free to rotate, it will be apparent that upon rotation of the ratchet 20, the wedges 18 will be drawn toward the operating pulleys so that spindle 6 will be lowered in an eccentric relationto' spindle l and will be held from excessive movement by means of the spring 23. Adjustment to increase the eccentricit oi? the grind-i11 wheel 'n'ia be a c J eflecte'd during operation of the grinder by manipulating small lever 21, which carries a pivoted pawl 22, normally pressed inward by a spring 22. A single downward'pressure upon the outer end of lever 22 causes a very small outward movement of the grinding wheel. To permit restoration of the wheel toward a position concentric with the main spindle l the ratchet wheel may be rotated in the reverse direction by the fingers, or otherwise after the grinder has been, stormed in order to remove a finished work piece. It will be noted in Figure 1 that the'spindle- 6 which is arranged within the housing 25 rotates within suitable bearin'gsh arranged within the housing and disposed between the walls oithe housing and the spindle. I

Assuming now that a cylinder A is mount= ediuponthe" cross-feed o'l an ordina y' lathe anden-bloc with a series of cylinders and i't is'desired that these cylindersmay all be bored: at one sitting all that'is necessary is toescrewnut 2' upon thehspindle l' of the lathe which has a standard screw thread nut 2 having a standard screw threadito' co-inate with'thethre as on the spindle-and to affix a). belt from some power unit over pulley 4?;

The-workhavingzbeen correctly" centered on the cross-feed relative tdspiridle 1,'-it then can be nroved longitudinally relative 'member 6* forms contact with the cylinder A, the wedges 18 being moved outwardly toward the grinder by rotating the ratchet 20'5by means of the spring 23' the spindle 6 will be're'turned to its concentric position, relative to the spindle 1. After the first cylinder has been ground, the next-cylinder can be quickly and accurately placed in proper relation by operation of the cross' feed so that the" same can be quickly groundby' this device. l Vhile this devicecommends itself especially to lathework, it is obvious that nut 2 could be adapted to operate upon the spindle of milling machine and the same" relative movements obtained or it couldbe madeto' operate in anynrachine in which there is a provision for movement Of work relative to a spindle.

In placing this device in positionfor operation up'on the interior of a cylinder, the grinder 6 is inserted within theend' of tl'iefcylinder, the' spind'le 6 at this time being in concentric relation with the spindle l and as soon as the grinder -6 has been inserted to the proper position, the lugs l8 are adjusted within their guides to move the spindle 6 eccentric tothe' spindle 1 so that the grinder 6' will engage withtheflinterior surface of tlie'cylin'deri'rr,' as clearly ill'u's trate'd'iii Figures 1 and f3a The grinding operation is then carried on until the interror o'li 'the cylinder' is sufhcientl'y ground,

The wedges 18 are then moved toward the grinder 6 until the-spindle is again concentric with the spindle 1 so that the grinder 6" can be readily removed from the interior ofthe cylinder without contacting with the inner walls of the cylinder.

What I claim is: I a y I I. In mechanism tor-' grinding internal sui' lta'ces a rotatable support having a rela tively immovable extensionmember substantially parallel with'the axis oi the support a dap'ted to enter the bore'o fya hollow body, a grinding tool'spindle ustabl carried said extensio r' member substantially parallel therewith, and means whereby said spindle may be adjusted with respect to said extension: inem'benin order to'vary' its eccentricity" with respect was 'axis ofi, said extension member. I v 3 I 2. In grinding mechanism ofthe class de scribed,- a rotatable support, a grinding tool spindle carried by support substantially parallelwith the axis and rotatabie independently of said support, means for adjusting the grinding tool spindle to vary the degree of eccentricity thereof with respect to the axis of said rotatable support, said means including a deviceconstantly exerting a yielding force tending to move the grinding wheel spindle toward said axis and a device for positively moving said spindle away from said axis in opposition to the force of said yielding device.

3. In grinding mechanism of the class described, a rotatable support, a grinding tool spindle carried by the sup-port substantially parallel with the axis and rotatable independently of said sup-port, and means including a wedging device for adjusting the grinding tool spindle to vary the degree of.

5. In grinding mechanism of the class described, a rotatable support, a lever pivoted to the support at one side of the axis thereof, a grinding tool spindle journaled in thelever on an axis substantially parallel with the axis of the rotatable support, said spindle being rotatable independently of said support, a yieldable device constantly exerting force tending to move the lever in a direction to lessen the degree of eccentricity of said axis, and adjusting means adapted to move the lever positively in a direct-ion to increase the degree of said eccentricity.

6. In grinding mechanism ofthe class described, a. rotatable support comprising an extension member substantially parallel with the axis of rotation of said support, a

grinding tool spindle carried by said extension member parallel with said axis, said spindle being rotatable independently of said support, and adjustable so as to vary the degree of eccentricity of said spindle with respect to said axis, a wedge bar parallel with said spindle for adjusting it and means whereby the wedge bar maybe moved longitudinally.

7; In grinding mechanism of the class described, a rotatablesupport comprising an extension member substantially parallel with the axis of rotationof the support,

levers pivoted to said extension member f transversely thereof, a grinding tool spindle journaled in said levers and rotatable independently of said support, aspring tending to move saidlevers in a direction to reduce the degree-of eccentricity between said spin-.

dle and axis, and abar having Wedge surfaces engaging between said extension member and the levers adapted to movethe levers in opposition to the forceof the'spring.

8. In a grinding attachment for lathesor" the like, a support adapted to be secured to the spindle of a lathe, a grinding tool spindle hinged to said support, means for rotating; the. spindle and support at different relative speeds, and means forchanging the degree of eccentricity between the axes of the support and spindle, I

9. In a grinding attachment for lathes or the like, a support adapted to be secure-d to the spindle of a lathe, a grinding tool spindle hinged to said support, means for rotating the spindle and support at different relative speeds, and means for changing the degreeof eccentricity between the axes of the support and spindle while the grinding tool is in operation.

10. A cylinder grinding attachment for I lathes and the like including a support adapted to be secured. tothe spindle of the lathe, a grinding tool spindle adjust-ably mounted on the support, means for'rotating the support and, spindle atdifi'erent relative speeds, and means'fo-r changing the degree of eccentricity between the axes of the support and spindle.

lathes and the like including a support vadapted to be secured to the spindle of the 11. A cylinder grinding attachment" for lathe, a grinding tool spindle adjustably mounted on the support, means for rotating 1 the'support and spindle at different relative speeds, and means for changingthe degree of eccentricity between the axes of the support and spindle while the grinding tool is. j

in operation.

In testimony whereofIaifix my signature.

HORACE G. KENNEDY. 

